/*
 * Debugging utilities.
 * Copyright (c) 1998 New Generation Software (NGS) Oy
 *
 * Author: Markku Rossi <mtr@ngs.fi>
 */

/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA
 */

/*
 * $Source: /usr/local/cvsroot/ngs/js/src/debug.c,v $
 * $Id: debug.c,v 1.6 1998/08/25 09:51:35 mtr Exp $
 */

#include "jsint.h"

#ifdef JS_RUNTIME_DEBUG

/*
 * Global functions.
 */

#define STRING_MAX_PRINT_LEN	10

void js_vm_stacktrace(JSVirtualMachine * vm, unsigned int num_frames)
{
	unsigned int frame = 0;
	JSNode *sp = vm->sp;
	void *pc = vm->pc;
	JSNode *fp;
	char buf[512];
//    int i;

	sprintf(buf, "VM: stacktrace: stacksize=%d, used=%d%s",
			vm->stack_size, (vm->stack + vm->stack_size - sp), JS_HOST_LINE_BREAK);
#ifdef JS_IOSTREAM
	js_iostream_write(vm->s_stderr, buf, strlen(buf));
#else
	fwrite(buf, strlen(buf), 1, stderr);
#endif

	/* STACKFRAME */

	/* Find frame pointer. */
	for (fp = sp + 1; fp->type != JS_IPTR; fp++);

	/* The first iptr is the return address. */
	fp++;

	/* The second iptr is the with pointer. */
	fp++;

	/* The third item is a JS_ARGS_FIX node. */
	assert(fp->type == JS_ARGS_FIX);
	fp++;

	while (fp && frame < num_frames) {
		JSNode *n;
		const char *func_name = js_vm_func_name(vm, pc);

		sprintf(buf, "#%-3u %s%s:", frame++, func_name, func_name[0] == '.' ? "" : "()");
#ifdef JS_IOSTREAM
		js_iostream_write(vm->s_stderr, buf, strlen(buf));
#else
		fwrite(buf, strlen(buf), 1, stderr);
#endif

		if (vm->verbose_stacktrace) {
			sprintf(buf,
					" ra=0x%lx, wp=0x%lx, af=%d:%d, ofp=0x%lx",
					(unsigned long) (fp - 3)->u.iptr,
					(unsigned long) JS_WITHPTR->u.iptr,
					JS_ARGS_FIXP->u.args_fix.argc,
					JS_ARGS_FIXP->u.args_fix.delta, (unsigned long) fp->u.iptr);
#ifdef JS_IOSTREAM
			js_iostream_write(vm->s_stderr, buf, strlen(buf));
#else
			fwrite(buf, strlen(buf), 1, stderr);
#endif
		}

		for (n = sp + 1; n != fp - 3; n++) {
			switch (n->type) {
			case JS_UNDEFINED:
				sprintf(buf, " undefined");
				break;

			case JS_NULL:
				sprintf(buf, " null");
				break;

			case JS_BOOLEAN:
				sprintf(buf, " %s", n->u.vboolean ? "true" : "false");
				break;

			case JS_INTEGER:
				sprintf(buf, " %ld", n->u.vinteger);
				break;

			case JS_STRING:
				if (n->u.vstring->len > STRING_MAX_PRINT_LEN)
					sprintf(buf, " \"%.*s...\"", STRING_MAX_PRINT_LEN, n->u.vstring->data);
				else
					sprintf(buf, " \"%.*s\"", (int) n->u.vstring->len, n->u.vstring->data);
				break;

			case JS_FLOAT:
				sprintf(buf, " %g", n->u.vfloat);
				break;

			case JS_ARRAY:
				sprintf(buf, " array");
				break;

			case JS_OBJECT:
				sprintf(buf, " object");
				break;

			case JS_SYMBOL:
				sprintf(buf, " %s", js_vm_symname(vm, n->u.vsymbol));
				break;

			case JS_BUILTIN:
				sprintf(buf, " builtin");
				break;

			case JS_FUNC:
				sprintf(buf, " function");
				break;

			case JS_IPTR:
				sprintf(buf, " 0x%lx", (unsigned long) n->u.iptr);
				break;

			case JS_ARGS_FIX:
				sprintf(buf, " <num=%d, delta=%d>", n->u.args_fix.argc, n->u.args_fix.delta);
				break;

			default:
				sprintf(buf, " type=%d?", n->type);
				break;
			}
#ifdef JS_IOSTREAM
			js_iostream_write(vm->s_stderr, buf, strlen(buf));
#else
			fwrite(buf, strlen(buf), 1, stderr);
#endif
		}

#ifdef JS_IOSTREAM
		js_iostream_write(vm->s_stderr, JS_HOST_LINE_BREAK, JS_HOST_LINE_BREAK_LEN);
#else
		fwrite(JS_HOST_LINE_BREAK, JS_HOST_LINE_BREAK_LEN, 1, stderr);
#endif

		/* Move to the caller. */
		sp = fp;
		pc = fp[-3].u.iptr;
		fp = fp->u.iptr;
	}
}

#endif							/* JS_RUNTIME_DEBUG */
